4. Capital Stock

During the three months ended March 31, 2020, the Company issued a total of 151,027 shares of our common stock at a purchase price of $3.70 per share and warrants to purchase 151,027 shares of common stock at an exercise price of $3.70 per share to a group of investors for aggregate gross and net proceeds of approximately $0.6 million, of which, $0.5 million and $0.1 million was allocated to the common stock and warrants, respectively. The Company has classified these warrants on its consolidated balance sheets as equity and valued using the Black-Scholes model based on the following weighted average assumptions:


Risk-free interest rate		0.88	%
Expected volatility		106.7	%
Expected term		2	months
Expected dividend yield		—
Exercise price	$	3.70
Market value of common stock	$	3.11

During the three months ended March 31, 2020, the Company also issued 214,000 shares of our common stock to a group of investors in connection with the exercise of 214,000 previously issued warrants at $2.00 per share for aggregate gross and net proceeds of approximately $0.4 million.

During the three months ended March 31, 2020, the Company issued a total of 11,950 shares of our common stock to employees due to the vesting of restricted stock units and issuance of a common stock award.